Decay scheme of155Dy

The simple and coincidence spectra of gamma radiation accompanying the decay of¹⁵⁵Dy were measured with Ge(Li) and scintillation detectors. The source was obtained as a daughter product of¹⁵⁵Ho. The intensity or the upper limit of intensity were determined for all, and the multipolarity for most of the observed transitions. The coincidence measurements served as a basis for the introduction of new levels at 250, 1062, 1068, (1494) and 1638 keV, and as a proof of the existence of the 891, 1155, 1665 and 1749 keV levels proposed earlier.The authors wish to express their thanks to RNDr. Z. Plajner for his unrestricted support and assistance during the experiments, to N. A. Lebedyev for the preparation of the sources, to Professor F. L. Shapiro for the loan of the measuring apparatuses in the Joint Nuclear Research Institute, and to RNDr. I. Rezanka for his help in the measurements.